It overlooks the thriving city of Lannisport and sits atop the most productive gold mine in the Westerlands. Their seat is Casterly Rock, a castle on a rocky promontory overlooking the Sunset Sea. Their lands are in the far west of the continent. House Lannister is one of the Great Houses of Westeros. It currently swears fealty directly to the King of the Andals and the First Men, an office which is currently held by Bran Stark. With the deaths of Cersei and Jaime at the Battle of King's Landing, Tyrion is now the head of House Lannister and given up the crown in favor of an elective monarchy. The Lannisters continued to hold sway when Tommen Baratheon ascended the throne, with Kevan Lannister as Hand of the King and Protector of the Realm, but lost their hold over Tommen to the Faith of the Seven, and, after destroying the Great Sept of Baelor, Cersei took the throne. Lord Tywin was a key supporter of his reign in the War of the Five Kings. Their son Joffrey Baratheon had claimed the Iron Throne on the premise that he was actually fathered by the late King Robert Baratheon. The incestuous relationship of Cersei and Jaime had been concealed in a conspiracy. Their unofficial motto, which is as well known as the official one, is 'A Lannister always pays his debts' - which is used much more often and mostly in negative context, though it can also be used in the original, literal sense. House Lannister's Heraldry consists of a golden lion on a crimson background, and their house words are 'Hear me roar!', which are rarely mentioned. As the new royal House, they also ruled directly over the Crownlands from their seat of the Red Keep in King's Landing, the traditional seat of the royal family. They are the Lords Paramount of the Westerlands and Wardens of the West. Their seat is Casterly Rock, a massive rocky promontory overlooking the Sunset Sea which has had habitations and fortifications built into it over the millennia. The Lannisters rule over the Westerlands.

It was also the royal House of the Seven Kingdoms following the extinction of House Baratheon of King's Landing, which had been their puppet house during the War of the Five Kings, for a brief stint of time until House Targaryen took back the Iron Throne in Daenerys Targaryen's war for Westeros. House Lannister of Casterly Rock is one of the Great Houses of Westeros, one of its richest and most powerful families and one of its oldest dynasties. ' You have to give it to the Lannisters – they may be the most pompous, ponderous cunts the gods ever suffered to walk the world, but they do have outrageous amounts of money.' ― Renly Baratheon

Who becomes king under the mountain